import java.util.Scanner;
public class EX2_3 {
	public static void main (String args[] ) {
	System.out.println("请输入一个数，每输入一个数回车确认");
	System.out.println("最后输入数字0结束操作");
	Scanner reader = new Scanner (System.in);
	double sum = 0;
	double x = reader.nextDouble();
	while(x!=0){
		sum = sum+x;
		x = reader.nextDouble();
	}
	System.out.println("sum="+sum);
	}
}

